About Clock-Tani
Clock-Tani provides a variety of free time tools in one website for your daily needs.
About the Operator
Clock-Tani is a one-person web service operated by an indie developer, Tani. It started as a side project and is now provided for free, with hosting costs covered by ads. The goal isn't "a page built for ads" but "a tool users return to, even with ads."
I focus on frontend and full-stack web development with React, Next.js, and TypeScript. I built Clock-Tani because I was using a clock, timer, Pomodoro and interval tool every day and wanted them in one place. You can reach me on X (@teck_tani), and all inquiries are answered at admin@teck-tani.com.
Note: teck-tani.com is the operator Tani's personal domain, and admin@teck-tani.com is Clock-Tani's official contact channel. That's why the site domain (clock-tani.com) and the email domain differ.
Our Services
World clock for 70+ cities, digital/analog display
Millisecond precision, lap recording
Presets, 5 alarm sounds, screen wake lock
25 min focus + 5 min break, session statistics
Tabata, HIIT presets
Run up to 4 timers simultaneously
Multiple alarms, snooze, 5 alarm sounds
NTP sync, ticketing countdown
Anniversaries, exams, event countdowns
Features
- Completely free, no registration required
- Responsive design for mobile & desktop
- Bilingual support (Korean/English)
- Dark mode support
- Data stored locally in browser only (no server transmission)
- PWA support - install as an app
Service History
Clock-Tani development started
Launched online clock, stopwatch, and timer
Added Pomodoro, alarm, and server time features
Added interval timer, multi timer, and D-Day counter
Released multilingual (English) support and PWA
Ongoing feature improvements and usability updates
Strengthened policy pages, author bylines on guides, expanded advertising disclosures
Editorial & Maintenance Policy
- I review all content at least once a quarter and update the 'last modified' date at the bottom of each guide whenever facts change.
- If you spot an error or typo, please report it to admin@teck-tani.com — I usually fold corrections into the article within 1-3 days.
- When the advertising disclosure, privacy policy, or terms of service change, I bump the 'last updated' date on that page and post a short summary of what changed.
Technology Stack
Clock-Tani uses cutting-edge web technologies to deliver a fast and reliable service.
Optimal performance through server-side rendering and static site generation
High code quality through type safety
Consistent and responsive design system
Offline support and app-like user experience
Precise alarm playback with no delay
Prevents screen from turning off during timers
Contact
For inquiries, bug reports, or suggestions, please email us below.
We typically respond within 1-2 business days. Feature suggestions and improvement requests are always welcome.